Gas-lamp for inverted incandescent burners.



A. s. FRANCIS. GAS LAMP FOR INVERTED INOANDESGENT BURNERS.

APPLIUATION FILED NOV. 17, 1906;

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Patented Dec. 15, 1908.

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czadrqzwag zw a'm A. S. FRANCIS. GAS LAM} FOR INVERTED- INOANDESGENT BURNERS.

APPLICATION FILED NQV.17, 1906.

Patented Dec. 15, 1908.

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ADOLPHUS SYDNEY FRANCIS, OF LONDON, ENGLAND.

GAS-LAMP FOR INVERTED INCANDESCENT BURNERS.

Specification of Letters Patent.

Patented Dec. 15, 1908.

Application filed. November 17, 1906. Serial No. 343,789.

To all whom it may concern:

Be it known that I, Anonrnns SYDNEY FRANCIS, a subject of the King of Great Britain, residing at 155 Farringdon road, London, England, have invented new and useful Improvements in Gas-Lamps for Inverted Incandescent Burners, of which the following is a specification.

This invention relates to improvements in gas lamps for containing clusters of inverted incandescent burners of the type in which a cluster of two or more inverted burners is employed in a globe or lantern I l the invention havlng for ob ect to increase the efficiency of the burners in such lamps and to render them readily accessible for cleaning, adjustment and repair.

Heretofore it has generally been the prac tice to employ a cluster of two or more straight burners of the ordinary inverted type with a deflector or insulator for each The separate deilectors took up the result was that burner. a good deal of seace and it was impossible to arrange the lamp in a convenient form and of such a size as to allow of the necessary space for the access of sufficient pure air to supply both the mixing chamber and the flame. Besides these i objections diliieulty has been experienced inasmuch as the products of combustion in ascending became mixed with the pure air entering the lamp and passed into the mixing i chambers, the result being that an imperfectly burning gaseous mixture was pro duced and the combustion at the point of the burner was not perfect. 1 To obviate the aforesaid drawbacks the top portions of the burners have been shut off from the bottom portions and the lamp thus divided into two parts the products of combustion escaping below such division and the air for the mixture entering above but in this case certain portions of the products of combustion enter with the fresh air. In this case it is also necessary to use a globe with air inlets at the bottom or therei abouts to supply air to the point of combustion. It has also been proposed to make a lamp of the above described type with a ring gas supply pipe and a number of so called bent tube Bunsen burners connected to and arranged to project radially inwards from the said ring pipe, the said bent tube burners passing through holes in a chimney of metal or other suitablematerial, pwhich pchimney was flared at its i lower end or both at its lower and upper ends. Now according to this invention a chimney of this description is employed having holes in the sides thereof according to the number of burners to be used and through each hole passes a straight or vertically arranged inverted Bunsen burner, which burners are either connected to a ring supply pipe or by branches or otherwise to an ordinary gas supply pipe.

Figure 1 of the accompanying drawings illustrates in sectional elevation an indoor lamp constructed according to this inven tion and Fig. 2 is a plan thereof. Fig. 3 is a sectional elevation of a slightly modified "form. Figs. 4c and 5 are details of other mo di'lie ations in sectional elevation and Figs. (3 and 7 are similar views of two constructions of outdoor lamps.

Referring to Figs. l. and 2 it will be seen that the lamp is provided with a trumpetshaped chimney a that is to say the chimney is shaped more or less like the frustum of a cone, the wider part of which is below while the narrower pa rt is above and if desired and as is shown the upper part may also be formed more or less cylindrical. This chimney is conwrniently 'l'nadc of enameled iron or it may be made of other suitable material. The straight inverted burners 1; which are preferably merely straight metal Bunsen tubes provided with gas nipples and with mixing chambers c at the top and suitable mouthpieces and mantle supports at the bottom but without deflector or other like contrivance, pass vertically or thereabouts through holes in the side of the chimney near the lower end thereof so that the points of the burners are within the cone of the chimney a, while their mixing chambers or heads 0 with their air inlets are outside of the chimney, thus the products of combustion flow straight up within the chimney, away from the air inlets. There may be two, three or more of these burners arranged equidistant from each other and parallel to the axis of the chimney (four being shown in this construction) and these burners may be connected to a circular gas pi pe e common to all the burners, which circular pipe is connected by a bent tube or tubes to the gas supply pipe which is provided with a cock for opening and closing the gas supply.

The lamp is provided with a globe g to pre vent drafts from affecting the burners. This globe is preferably, but not necessarily, en-

tirely closed at the bottom and is suspended from an annular plate 7i hinged at 'i or otherwise connected to a ring or corona 76 which forms, or may have connected thereto a reflector as shown in dotted lines and marked Z. The annular plate has on the other side opposite to the hinge a latch m or it may be a hasp or other simple fastening. This annular plate 7L may if desired be provided with a number of holes n to admit air to the interior of the globe to support the combustion of the flames, and if desired to the upper part of the lamp for the supply of additional air to the mixing chamber but unless the upper part of the lamp is inclosed it is not absolutely essential. The chimney may be held in position by means for instance of small brackets 0 fixed to the smoke shade or bell p and the latter is suitabl attached by a lug g to the main gas supply pipe connection r. The chimney may also in addition be attached to the pipes by screws or lugs s and below it is fixed to the corona 76 by brackets 2,. The corona is further supported by stays a from the gas supply pipes f.

Instead of making the chimney in the form of the frustum of a cone below and if desired l I l I also more or less cylindrical at the top as l shown in Fig. 1 it may as shown in Fig. 3 and marked 0 be flared at both ends. Further each burner may also be provided with a valve to so that in case a mantle should be damaged or destroyed it is easy to shut off the supply of gas to take away the damaged mantle and to replace it by a new one. In this example the annular plate h is shown ad justably secured'to the corona is by means of a hasp :10. Further the circular gas supply pipe e is connected to the main gas supply 1" by a single bent tube 1 If desired and as shown in Fig. l each burner 12 is connected by a separate supply pipe 2 leading from the main supply pipe 1* at the top of the lamp instead of being all connected to a common circular or ring gas supply pipe.

Fig. 5 shows a chimney having only two burners (but there might be more) and the burner tubes 1 parallel and straight for the greater part of their length but provided with two bends so that the mantles 2 may be closer together without necessitating any restriction in the diameter of the chimmey. If the lamp be intended for use out of doors, the upper part of the lamp is as shown in Fig. 6 incased and provided with a domed or otherwise shaped top to prevent the ingress of rain and wind the products of combustion rising up the cone shaped chimney and escaping by way of openings below the top or cowl of the lamp as is usual with street lamps. The lower part of the chimney a is inclosed by an outer chimney 3 so as to leave sufficient space for the air to pass to the mixing chambers of the burners. This outer chimney may also be provided with holes 4 for the admission of air to supply the burners and such holes may be shielded from rain and direct drafts or wind by an annular cap or covering 5. The holes 4 however are not essen tial and if they are dispensed with the annular cap is also superfluous. The outer chimney 3, its extension 6 and the top 7 may be in one piece or substantially so or as shown the top 7 is separate while the extension 6 and the outer chimney 3 are in one piece. The inner cone shaped chimney a is fixed therein by means of stays 8, the spaces between the inner and outer chimneys being divided by a plate 9 or other contrivance, thus separating the annular space into two parts the lower part 10 containing the heads of burners effectually shutting same off from the upper part 11 which contains products of combustion because the upper end of the chimney a opens into same. Air is admitted through the perforations 12 in the annular plate It aforesaid some of which passes into the globe 9 while the rest passes between the outer chimne r 3 and the inner chimney a to supply air to the mixing chambers of the burners. Or as shown in Fig. 7 the burners l are not quite vertical being slightly inclined towards each other the outer chimney 13 may be fitted to theinner chimney a by the 5 flanged part 14 and the top 15 of the lamp maybe made in one piece with the annular extension 16.

What I claim as my invention, and desire to secure by Letters Patent is An inverted incandescent gas lamp comprising a gas supply pipe, a flared chimney presenting on its interior an inwardly convex gradually curving surface, a number of straight inverted Bunsen burner tubes passing through said chimney at some distance from the lower end thereof, a supply pipe connected with said Bunsen tubes, air inlets to said tubes above the points of intersection with said chimney, mantle supporting means upon the free end of each burner, the points of the burners with the mantlesupporting means being within the circumference of the flared chimney, a globe support and a globe seated in said support and having its upper edge situated in about the same plane as that containing the lower edge of the chimney, substantially as set forth.

In testimony whereof I have name to this specification in the two subscribing witnesses.

ADOLPHUS SYDNEY FRANCIS.

signed my Vitn esses:

V. JENSEN, H. D. JAMESON. 

